code: def test_pos_raises(self):
      df = pd.DataFrame(
          {"a": pd.to_datetime(["2017-01-22", "1970-01-01"])}
      )
      msg = r"bad operand type for unary \+: 'DatetimeArray'"
      with pytest.raises(TypeError, match=msg):
          (+df)
      with pytest.raises(TypeError, match=msg):
          (+df["a"])
  
file_path: pandas/pandas/tests/frame/test_unary.py
imports: from decimal import Decimal
  import numpy
  import pytest
  from pandas.compat.numpy import np_version_gte1p25
  import pandas
  import pandas._testing
label_desc: Use image node_id 10 for calling the TestDataFrameUnaryOperators obj's underlying member method code with example usage: obj.test_pos_raises() without return types